This is a 2 channel equaliser, it's basically two 551E's stacked one above the other. There are 5 identical bands of parametric EQ each with a gain knob providing 15dB of cut or boost, a Q (bandwidth) knob with a range from .05 to 2 octaves and a frequency knob.The frequency knob covers the full spectrum in three ranges that can be selected by each bands three way switch.The available ranges are 10Hz to 200kHz, 100Hz to 2kHz and 1kHz to 20kHz. In addition to the parametrics there are high and low cut filters operating at 12dB per octave in ranges from 3kHZ to 65kHZ and 260Hz to 6Hz respectively.

Good Points
The fact that the controls are stacked one above the other means that setting this up for stereo operation is easier than a unit with its channels side by side. 5 parametric bands let you work on 5 completely different frequencies at the same time or in the same frequency area using all 5 bands, should you want to do that, so it's a pretty versatile machine. Whatever combination of frequency bands you use, the 522E is capable of both serious corrective work and more general tonal shaping, often at the same time. A very useful piece of kit to have in the rack.

Symetrix 552E Specifications:

Digital IOs:

Analog IOs:
Left and right ins and outs on unbalanced jacks and balanced XLR's